Take on this intense ab challenge to strengthen and tone your core before the new year! Complete 200 mountain climbers, 100 sit-ups, 100 Russian twists, and 100 side-to-sides in this full-core workout ...
Cassidy Thompson on MSN

AB challenge | Intense ab workout

Take on this AB challenge to strengthen your core and tone your abs! This intense ab workout can be done at home with no ...
Looking for a quick ab workout to fire up your core? This seven-minute intense ab challenge targets your lower abs with no equipment. To find out for myself, I unrolled my yoga mat and gave it a go ...